Microsoft Store lists T-Mobile Lumia 640 as 'coming soon' for $89

For those of you looking to get a Lumia 640 on T-Mobile, the Microsoft Store is now listing the device as "coming soon" with a price of $89.
Specifically, Microsoft is listing the white version of the Lumia 640 for T-Mobile at a very budget-friendly price of $89 though it isn't yet available for purchase. This is the no-contract pricing, too.